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I've tried to understand ECMAScript 2015 specification in one point: Internal Slots of Objects. But this section appeared very unclear to me, especially this sentence: Internal slots correspond to.

It conforms to PCI Express V3.0 specification and is downward compatible with PCI Express v2.0 1.0. Support 6.0 Gbps, 3.0 Gbps and 1.5 Gbps of communication ...

(All of the PCI Express slots conform to PCI Express 3.0 standard.) 2 x PCI ... 4 x DDR3 DIMM sockets supporting up to 32 GB of system memory * Due to ...